Polymarket prices Cooper at 73% in North Carolina Senate race
Polymarket traders priced North Carolina Senate candidate Cooper at 73% to win the 2026 election as of early August, while Kalshi showed the Democrat at 91.9%. The spread between the two CFTC-registered venues reached nearly 19 points on the same contest. Absentee ballots were set to go out September 4. The coverage framed prediction-market odds alongside traditional polling in the midterm cycle. Cooper left the North Carolina governorship in 2025 and is seeking a U.S. Senate seat.
A nearly 19-point pricing gap between two CFTC-registered venues on the same Senate race is unusually wide for a liquid political market. For traders, that spread signals either an arbitrage opportunity or a hidden liquidity problem on the thinner book. Cooper's 73% on Polymarket versus 91.9% on Kalshi means a trader with conviction can express the same view at very different prices depending on venue choice. The September 4 absentee-ballot deadline compresses the timeline: as voting begins, any material polling shift could force rapid repricing that leaves one venue catching up.
For Polymarket, this gap risks reinforcing concerns about price stability on non-presidential races where its volume edge is thinner. Kalshi's higher price may reflect a smaller, more localized participant pool with sharper North Carolina sentiment, or simply less two-sided flow. The platform that settles closer to the actual result will gain credibility for midterm Senate contracts, where both venues are competing to list competitive races.